4. Azzam – $732 million
Another luxurious liner owned by a UAE royalty – the Azzam, owned by Sheikh Khalifa bin Zayed Al Nayan, President of the UAE and Emir of Abu Dhabi. Built by Lürssen Yachts, this vessel is rumoured to be “the most complex and challenging yacht that has ever been built”. However, the most impressive feature of the yacht is not its price tag, nor extravagant interior, it’s its size. With its length of 180m, the Azzam proudly takes the first place as the largest private yacht in the world. Moreover, this superyacht is not only enormous, but also quite fast, reaching speeds of more than 35mph (30 knots).